:root {
  --background: oklch(0.145 0 0);
  --card: oklch(0.205 0 0);
  --muted: oklch(0.269 0 0);
  --border: oklch(1 0 0 / 12%);
  --foreground: oklch(0.985 0 0);
  --muted-foreground: oklch(0.708 0 0);
  --primary: oklch(0.922 0 0);
  --primary-foreground: oklch(0.205 0 0);
  
  --good: oklch(0.72 0.15 155);   /* #43c07a - nominal */
  --warn: oklch(0.78 0.14 80);    /* #e6ac3d - moderate thinning */
  --crit: oklch(0.65 0.18 25);    /* #e85854 - necking / thinning danger */
  --info: oklch(0.62 0.16 255);   /* #3986e4 - thickening */
  
  --radius: 10px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--background);
  color: var(--foreground);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.45;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Header */
header {
  height: 56px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--card);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

h1 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--foreground);
}

.badge-topic {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 3px 8px;
  border-radius: 6px;
  background-color: var(--muted);
  border: 1px solid var(--border);
  color: var(--muted-foreground);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 9999px;
  border: 1px solid var(--border);
  background-color: var(--card);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--good);
}

.status-pill.warning .status-dot {
  background-color: var(--warn);
}

.status-pill.critical .status-dot {
  background-color: var(--crit);
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Main Layout */
main {
  flex: 1;
  padding: 24px;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  max-width: 1720px;
  margin: 0 auto;
  width: 100%;
}

/* Sidebar / Controls */
aside.control-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.16);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--foreground);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted-foreground);
  display: flex;
  justify-content: space-between;
}

.control-value {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--foreground);
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
  height: 6px;
  background: var(--muted);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

select {
  height: 32px;
  padding: 0 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background-color: var(--muted);
  color: var(--foreground);
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
  cursor: pointer;
}

.btn-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

button {
  font-family: var(--font-sans);
  white-space: nowrap;
  font-size: 13px;
  font-weight: 500;
  height: 32px;
  padding: 0 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background-color: var(--muted);
  color: var(--foreground);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.15s ease;
}

button:hover {
  background-color: oklch(0.32 0 0);
  border-color: oklch(1 0 0 / 20%);
}

button.primary {
  background-color: var(--primary);
  color: var(--primary-foreground);
  border-color: transparent;
  font-weight: 600;
}

button.primary:hover {
  background-color: oklch(0.98 0 0);
}

/* Visualization Grid */
.vis-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Metrics row */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.metric-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted-foreground);
}

.metric-value {
  font-size: 24px;
  font-weight: 600;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--foreground);
}

.metric-sub {
  font-size: 11px;
  color: var(--muted-foreground);
  display: flex;
  align-items: center;
  gap: 4px;
}

.metric-sub.danger { color: var(--crit); }
.metric-sub.warning { color: var(--warn); }
.metric-sub.success { color: var(--good); }
.metric-sub.info { color: var(--info); }

/* Viewports Row (2D and 3D) */
.viewports-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.viewport-panel {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 480px;
  position: relative;
}

.panel-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--card);
  z-index: 10;
}

.panel-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--foreground);
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.canvas-wrapper {
  flex: 1;
  position: relative;
  background-color: oklch(0.12 0 0);
  overflow: hidden;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Colormap Bar overlay */
.colormap-legend {
  position: absolute;
  bottom: 14px;
  left: 16px;
  right: 16px;
  background: rgba(20, 20, 20, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 20;
}

.colormap-labels {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--muted-foreground);
}

.colormap-bar {
  height: 10px;
  border-radius: 4px;
  background: linear-gradient(to right, 
    #ef4444 0%, 
    #f59e0b 25%, 
    #10b981 50%, 
    #06b6d4 75%, 
    #3b82f6 100%
  );
}

.colormap-notes {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--muted-foreground);
}

/* Inspection Tooltip on Canvas */
.inspection-overlay {
  position: absolute;
  top: 14px;
  right: 14px;
  background: rgba(20, 20, 20, 0.9);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  pointer-events: none;
  z-index: 20;
}

/* Graph Section */
.chart-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chart-canvas-container {
  height: 220px;
  position: relative;
  background: oklch(0.12 0 0);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

/* Bottom Explanations */
.explanation-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.expl-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.expl-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  width: fit-content;
}

.expl-badge.thinning {
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--crit);
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.expl-badge.neutral {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--good);
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.expl-badge.thickening {
  background-color: rgba(6, 182, 212, 0.2);
  color: var(--info);
  border: 1px solid rgba(6, 182, 212, 0.4);
}

.expl-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--foreground);
}

.expl-text {
  font-size: 12px;
  color: var(--muted-foreground);
  line-height: 1.5;
}

/* Responsive adjustments */
@media (max-width: 1280px) {
  main {
    grid-template-columns: 1fr;
  }
  .viewports-grid {
    grid-template-columns: 1fr;
  }
  .metrics-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .explanation-grid {
    grid-template-columns: 1fr;
  }
}

/* Phones */
@media (max-width: 640px) {
  header {
    height: auto;
    padding: 10px 14px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .header-title h1 {
    font-size: 15px;
  }
  .header-title .badge-topic,
  .panel-actions,
  .chart-header .badge-topic {
    display: none;
  }
  main {
    padding: 12px;
    gap: 12px;
  }
  main > *,
  .vis-container,
  .control-panel,
  .viewport-panel,
  .chart-card {
    min-width: 0;
  }
  .metrics-row {
    gap: 10px;
  }
}